Real Dictionary

toot
verb: If someone toots their car horn or if a car horn toots, it produces a short sound or series of sounds.

toot in American English
a short blast of a horn, whistle, etc.
to blow a horn, whistle, etc. in short blasts
to cause to sound in short blasts

toot in American English 1
intransitive verb: to give forth its characteristic sound
noun: an act or sound of tooting
transitive verb: to cause (a horn, whistle, or wind instrument) to sound

toot in American English 2
noun: a period or instance of drunken revelry; binge; spree

toot in American English 3
noun: a lavatory; toilet

toot in American English 4
noun: a paper bag

toot in British English 1
noun: the sound made by or as if by a horn, whistle, etc
verb: to give or cause to give (a short blast, hoot, or whistle)

toot in British English 2
noun